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The possibility of the direct measurement of micelle weight by electrospray ionization mass spectrometry

✍ Scribed by Daisuke Nohara; Takashi Ohkoshi; Tomoya Sakai

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 54 KB
Volume: 12
Category: Article
ISSN: 0951-4198
DOI: 10.1002/(sici)1097-0231(19981215)12:23<1933::aid-rcm410>3.0.co;2-n

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✦ Synopsis

Measurement of the molecular weight of micelles, which are characteristic aggregates of molecules, was conducted using electrospray ionization mass spectrometry (ESI-MS). Micelle solutions were prepared by dissolving octyltrimethylammonium bromide [OTAB: C 8 H 17 N(CH 3 ) 3 Br] in water alone, without other additives. From the measurement of the m/z of the doubly or triply charged ions, it was revealed that the micelle of OTAB exhibited an almost symmetrical and polydisperse distribution about the mean molecular weight of 5000-5500. This molecular weight information is in good accordance with other estimated values. This result demonstrated the possibility of a direct measurement of micelle weight by mass spectrometry.

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